package com.itheima.mp.congfig;

import com.itheima.mp.filter.JWtAuthenticationTokenFilter;
import com.itheima.mp.handler.AccessDeniedHandlerImpl;
import com.itheima.mp.handler.AuthenticationEntryPointImpl;
import com.itheima.mp.utils.RedisCache;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@Configuration
@EnableMethodSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SpringSecurityConfig {

    @Autowired
    private AuthenticationConfiguration authenticationConfiguration;

    @Autowired
    private RedisCache redisCache;

    //
    @Autowired
    private JWtAuthenticationTokenFilter jwtAuthenticationTokenFilter;

    // 认证失败处理器
    @Autowired
    private AuthenticationEntryPointImpl authenticationEntryPoint;

    // 授权失败处理器
    @Autowired
    private AccessDeniedHandlerImpl accessDeniedHandler;

    // 配置 Spring Security
    @Bean
    public PasswordEncoder passwordEncoder() {
        // 返回你自定义的 PasswordEncoder
        return new BCryptPasswordEncoder();
    }

    @Bean
    SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/user/login").anonymous()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated();

        // 添加JWT过滤器，JWT 过滤器在 UsernamePasswordAuthenticationFilter 之前执行
        http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
        // 配置异常处理器
        http.exceptionHandling()
                .authenticationEntryPoint(authenticationEntryPoint)
                .accessDeniedHandler(accessDeniedHandler);
        return http.build();
    }

    @Bean
    public AuthenticationManager authenticationManager() throws Exception {
        return authenticationConfiguration.getAuthenticationManager();
    }
}